Microsoft would like to give its users a better idea of whether a Web site or e-mail attachment is trustworthy. But how you identify people on the Internet without raising serious privacy concerns? It's a problem that Microsoft hopes to solve first by engaging in discussion.

"We've been talking about this since last year, spending a lot of time with the policy makers," said Doug Leland, general manager of Microsoft's Identity and Security Business Group, in an interview. "This is an agenda we're trying to advance with the reset of the industry and with policy makers and lawmakers and law enforcement as a proposal of a solution to tackle a very significant problem."